Double tap wake up/call disconnect

Been using Z2 for over a week and power button call disconnect thing annoys me. I want to be able to pick up/disconnect call without having to use touch screen. So I use EZ answer app to accept calls with camera and power button to disconnect calls.

During call while using headphones, there's no easy way to wake screen up without disconnecting call. Using power button or double tap wake disconnects the call.

Can anyone tell me a workaround or point me to the hardware keys mapping so that I can try to find a fix for this. I've tried hardware mapping keys and edited few files but no luck. Appreciate any help. Thanks.

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